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authorMarshall Dawson <marshalldawson3rd@gmail.com>2018-10-25 13:01:55 -0600
committerMartin Roth <martinroth@google.com>2018-10-29 18:01:43 +0000
commit46fc6847832e77f3b1fc1a5c27265874508f2926 (patch)
tree1ba57c7bf371d815c721856262379345893ef566 /src/cpu/x86
parentbf00401e8a4d58c2717ae0d9d45ea5a0114b0990 (diff)
downloadcoreboot-46fc6847832e77f3b1fc1a5c27265874508f2926.tar.xz
x86/mp_init: Add configurable stack size for SMM relocate
A stack overrun has been observed on AMD64 CPUs during the SMM module relocation process. Change the assumed required size from equaling the save structure's size to a Kconfig symbol. A value of 0x400 doubles the size used by AMD64 systems and maintains the size used by EM64T. BUG=b:118420852 TEST=S3 on Grunt and verify 0x2f000-0x30000 uncorrupted Change-Id: Ib1d590ee4afb06ca649afd6ad253cdfd969ae777 Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com> Reviewed-on: https://review.coreboot.org/29277 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'src/cpu/x86')
-rw-r--r--src/cpu/x86/Kconfig8
-rw-r--r--src/cpu/x86/mp_init.c2
2 files changed, 9 insertions, 1 deletions
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index 5e2d79657e..232fe63f32 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -118,6 +118,14 @@ config SMM_MODULE_STACK_SIZE
This option determines the size of the stack within the SMM handler
modules.
+config SMM_STUB_STACK_SIZE
+ hex
+ default 0x400
+ depends on SMM_TSEG
+ help
+ This option determines the size of the stack within the SMM handler
+ modules.
+
config SMM_LAPIC_REMAP_MITIGATION
bool
default y if NORTHBRIDGE_INTEL_I945
diff --git a/src/cpu/x86/mp_init.c b/src/cpu/x86/mp_init.c
index aa2a4695a4..fb3a98691b 100644
--- a/src/cpu/x86/mp_init.c
+++ b/src/cpu/x86/mp_init.c
@@ -773,7 +773,7 @@ static void adjust_smm_apic_id_map(struct smm_loader_params *smm_params)
static int install_relocation_handler(int num_cpus, size_t save_state_size)
{
struct smm_loader_params smm_params = {
- .per_cpu_stack_size = save_state_size,
+ .per_cpu_stack_size = CONFIG_SMM_STUB_STACK_SIZE,
.num_concurrent_stacks = num_cpus,
.per_cpu_save_state_size = save_state_size,
.num_concurrent_save_states = 1,